<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>盒子模型</title>
    <style>
          div{
              width: 100px;
              height:100px;
             background-color:pink;
             /* 
             content 
             margin 外边距  --可以改变元素的位置
             borderb边框  --改变width height
             padding 内边距 --改变width height
             */
        margin-left:100px;
        margin-right:100px;
        margin-top:25px;
        margin-left: 100px;
        margin-bottom: 100px;

        border:10px solid #333;
        /* border:width style color */
        padding-top:20px;
      }

    </style>
  
</head>
<body>
    <div>
     aaaaaa
    </div>
    <p>hello world</p>
</body>
</html>